Which of the following describes a chemical reaction?
A. Molecules mix without interacting.
B. Atoms in substances react with each other.
C. Substances change shape but not properties.
D. Molecules interact without bonds breaking.
I think the correct answer from the choices listed above is option B. Atoms in substances react with each other describes a chemical reaction. From the statement itself, the word react is present this signifies a reaction. Hope this answers the question.